callisthenics

Programmed, rhythmic, relatively light exercises, performed without weights or other apparatus, and designed to enhance body image, cardiovascular fitness, flexibility and the tone (but not significantly the bulk) of muscles.

— Neil C. Spurway

Systematic, rhythmic, light exercises, such as abdominal curls and push-ups, that utilize the weight of the body as resistance. Callisthenics are designed to tone and strengthen muscles, and to promote general fitness.